本文關(guān)鍵詞： 農(nóng)業(yè)小流域 硝態(tài)氮 暴雨徑流 紫色土丘陵區(qū) 水文示蹤　出處：《水利學(xué)報(bào)》2016年08期 　論文類型：期刊論文

【摘要】：為揭示亞熱帶丘陵區(qū)農(nóng)業(yè)小流域暴雨過程中硝態(tài)氮遷移規(guī)律及其主要水文輸送途徑,本研究通過對(duì)紫色土丘陵區(qū)典型農(nóng)業(yè)小流域典型暴雨過程跨尺度(從3~1 236 hm2)連續(xù)監(jiān)測,分析徑流硝態(tài)氮遷移動(dòng)態(tài)特征及其尺度效應(yīng),并對(duì)比δ18O和硝態(tài)氮作為示蹤劑的端元混合分析(EMMA)解析結(jié)果,探討硝態(tài)氮作為暴雨過程水文示蹤劑的可行性。結(jié)果表明:(1)兩場暴雨事件中源頭小流域蘇榮小流域(含集鎮(zhèn)污水)徑流中硝態(tài)氮濃度最高,而到達(dá)梯級(jí)小流域出口處(萬安小流域)硝態(tài)氮濃度最低,林地來水的貢獻(xiàn)是較大尺度小流域徑流硝態(tài)氮濃度降低的主要原因,坡耕地壤中流補(bǔ)給可能是徑流消退過程中硝態(tài)氮出現(xiàn)濃度峰值的主要原因。(2)EMMA模型解析結(jié)果顯示:δ18O與硝態(tài)氮均能示蹤農(nóng)業(yè)小流域徑流消退期間壤中流補(bǔ)給過程;但硝態(tài)氮在受人居活動(dòng)強(qiáng)烈影響子流域的示蹤應(yīng)用需謹(jǐn)慎。以農(nóng)業(yè)為主的亞熱帶丘陵區(qū)小流域中,硝態(tài)氮具有同時(shí)作為環(huán)境效應(yīng)指示劑和水文示蹤劑的潛力,但其應(yīng)用效果仍有待于進(jìn)一步驗(yàn)證。
[Abstract]:Transportation of migration of nitrate nitrogen in subtropical hilly region revealed small agricultural watershed in the rainstorm process and main hydrology, through the study of typical rainstorm process in purple hilly area of typical agricultural watershed scale span (from 3~1 to 236 hm2) continuous monitoring, analysis of runoff nitrate migration dynamic characteristics and scale effect, and compared 18O. And nitrate as endmember tracer mixture analysis (EMMA) to investigate the analytical results, the nitrate nitrogen as the feasibility of rainstorm process of tracer hydrology. The results showed that: (1) two rainstorm events in small watershed source Su Rong small flow domain (sewage containing town) the concentration of nitrate nitrogen in runoff is highest, and arrived at the small watershed cascade exit (small watershed Wanan) the concentration of nitrate nitrogen was lowest, woodland runoff contribution is the main reason of large scale watershed runoff nitrate concentration decreased, slope cropland interflow recharge may be runoff recession process The main reason of nitrate nitrogen concentration peak. (2) analysis results of EMMA model showed that delta 18O and nitrate nitrogen were small watershed runoff agriculture tracer interflow dissipated during the recharge process; but the nitrate in the human activities are strongly influenced by the sub basin tracer applications need to be cautious. The agricultural small watershed subtropical hilly region, nitrate nitrogen has at the same time as the environmental effect indicator and hydrological tracer potential, but the effect still needs to be further verified.

【作者單位】： 中國科學(xué)院水利部成都山地災(zāi)害與環(huán)境研究所;中國科學(xué)院大學(xué);
【基金】：國家自然科學(xué)基金項(xiàng)目(41371241) 科技部973課題(2012CB417101)
【分類號(hào)】：X52
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本文編號(hào)：1542820